Question: Problem 4. A high-voltage power supply should have a nominal output voltage of 350 V. A sample of four units is selected each day and

Problem 4. A high-voltage power supply should

Problem 4. A high-voltage power supply should have a nominal output voltage of 350 V. A sample of four units is selected each day and tested for process-control purposes. The data (see sheet Problem4 in Homework 4.xlsx) give the difference between the observed reading on each unit and the nominal voltage times ten; that is, Xi = (observed voltage on unit i - 350)*10 (a) Set up and R charts on this process. Is the process in statistical control? (2 points) (b) If specifications are at 350 V +5 V, estimate Cp and Cpk, Pp and Ppk? (2 points) (c) What can you say about process capability Cp? (2 points) x2 x3 15 11 5 Sample x1 16 2 10 3 7 4 8 59 6 12 7 16 8 7 99 10 15 11 8 12 6 13 16 14 7 15 11 16 15 17 9 18 15 19 8 20 13 9 4 8 9 10 11 10 5 7 16 12 13 9 13 7 10 x4 10 6 10 6 7 10 8 10 8 10 14 9 13 13 10 9 4 12 13 16 11 15 12 16 14 10 11 12 15 13 10 10 8 7 6 14 11 12 10 9 11

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